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Maybe it's from Moo! but they don't mention anything but the user 1%/5%/25% badges.
This user has only worked on 4 projects and the gold badge is Collatz, the cow is YoYo and so the MM is either Docking or Moo!

MM for "Moo Moo"?

EDIT: If I'd read this Milestones sub forum a few more minutes before posting this the MM would have been made clear.